PPRuNe Knight in Shining Armour
Join Date: Feb 2000
Location: Everywhere in the UK, but not home!
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For every 1°C difference in ground temperature and dew point equates to 400ft cloud base. Thus for 4.5°C difference the cloud base will (theoretically) be 1800ft. The closest answer if therefore A.
The above uses a 2.5°C/1000ft lapse rate (from J Pratt's book)
The question seems to be using 3°C/1000ft lapse rate to give the exact answer of 1500ft.
This will be in the books, you just need to find it!
Last edited by Snigs; 7th Jul 2004 at 10:39.